Process of waterproofing paper tubes.



owns 3. LINDSAY, or rn rnrmnn, IAND'WALTER a.

313mm, or nnrnenronr,"

CONNECTIOUT, ASSIGNOBS TO UNION METALLIC CARTRIDGE COMPANY, OF BRIDGE- PORT CONNECTICU'T, CORPORATION OF CONNECTICUT. v

rnocnss or warnnrnoorirne rarnnrvnns.

1,130,303. No Drawing.

To all whom it may concern:

'Be it known that we, (1) CHARLES F. LINDSAY, a subject ofthe King of Great Britain, and (2) WALTER R. HmBARp, a citi- 5 zen of the United States, residing at (1) Fairfield. and (2) Bridgeport, county of Fairfield, State of Connecticut, have 'invented an Improved Process of Waterproof- 1 ing Paper Tubes, of which the following is a specification.

In the production of paper tubes, especially tubes which are intended for use in the manufacture of bodies for paper cartridge shells, it is desirable and necessary.

that the tubes shall be of uniform diameter throughout; that the surface shall be waterproofed; and for commercial reasons, that the color shall appear-the same, or nearly.

the same, over the entire nuter surface of the tubes. r The object of the present invention is to produce such tubes, and by employing the process hereinafter set forth, such object is accomplished."

Theusual practice in making such tubes is to roll a sheet of paper into tubular form and stickthe same; with suitable adhesive.

The tubes are dried, and after drying, theyv are lubricated, and by passing-through suitable dies, -they are polished and brought to Such tubes are'thenwater proofed by immersion in a bath' o fmoltenexact size.

parafiin wax or other suitable waterproofing material.

processes involved after the tube is, rolled and dried, and before the tube is immersed in the pa'raflin bath. We have found, by ,repeated experiments, that, by coating the 40 ,dry and .unsized paper tubes with poly.

. merlzable oils or suitable solutions or mixtures of .polymerizable oils with other lubricants, such oils .OIl mixtures serve as a very 'eflicient lubricant, and at the same time, af er gelatinization, give a superioz'r'waterproofing to the tubes. It should be" under- 'stood that the word sizing ,as herein used 7 refers to thepassage of the tubes. through dies, 'or by'iother means bringing the tubes 5 m exact" size. Asis Well kn9 l -these polymerizable oils may be gelatimzed by variousme'thodsof which it is only necessary to ,mentionihere application of heat, exposure to air for considerable time, .or

Specification of Letters Patent. I

Application filed May28,

Our invention relates specifically to the 1914. .Seria1No.841,529. 1

. ment with various chemical agents or gases.

' For our: purposes,

tubes to insure their gelatinization. Our in vention, however,should not be so restricted,

paanaanariaima we prefer heating the 'as we fully recognize that other methods of gelatinization maybe used. In sizing the tubes,

the dies become heated byfriction so that the polymerizable oil can be wholly or in part gelatinized. by this recess. We find n practice that our nove process gives a superior waterproofin' without additional treatment, but if pre erred the tubes may be additionally immersed in parafiin or other waxes, and treated in. the usual manner. q j 1 .f

We have demonstrated that tubes, after treatment .w1th polymerizabl'oils and cohtannng. but a small percentage of their welght 1n 011, are as Well waterproofed as tubes 1 which have been impregnated with paraflin wax or by. other process s,. and

. which contain sometimes upward o per cent. of. their weight in. wax.

A very efficient treatment consists surfac e treating the paper tubes with a solut1on of twenty parts'of Chinese wood oil,

(tung oil) ,nine parts of carbon tetrachlorid,

and one part offllibricating grease. Tubes, surface treated this material, sized, and heated, found-to contain approximately twqgan'd one-half per cent. of their weight of "g'latinized Chinese woodoil. and Y to be well .waterprOofed.

Having thus described bur inventiom-we...

claim;

1. The process, of waterproofing paper tubes'which consists in surface treating unsizedt/iibes with a polymerizable oil, sizing the same .by passage through"suitable dies,

" and thereafter.

able oil;

tubes which consists in coatin the unsized gelatinizing the poylmeriz 2. The process of :waterproofing paper: a

. tubes with a polymerizable 011, sizin the same,.and gelatinizing by heat. a

3-. The process the polymerize-be oil a 310a of waterproofing paper. tubes which consists in treating the unsiz ed np'aper tubeswithl a mixture of av polymeriz- N able oil and other lubricant and thereafter t sizin the same and by any suitable means gelat nizing the polymerizable oil contained therein.

' 4. The :process offwaterproofing Y j Wood. oil substantially as diescribed, sizing the same and geletinizing the Chinese wood oil by immersion'in a bath of molten wax.

5. The process of waterproofing paper tubes which consists in coating the same with e solution of Chinese wood. oil, sizing, and heating the tubes to geintinize the menses Chinese Wood oii' .contnineti therein, nndi thereafter impregnating with are Wax.

In testimony whereof We n 1 our signetures in presence of twowitnessesz CHARLEST. LINDSAY 4 WALTERR. HUBBARD. Witnesses: I

LENAVM. JonNsoN,

MARY S. Bnnnonens, 

